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1. WordNet® 3.0 (2006)
vapor
    n 1: a visible suspension in the air of particles of some
         substance [syn: vapor, vapour]
    2: the process of becoming a vapor [syn: vaporization,
       vaporisation, vapor, vapour, evaporation]

2. The Collaborative International Dictionary of English v.0.48
Vapor \Va"por\, n. [OE. vapour, OF. vapour, vapor, vapeur, F.
   vapeur, L. vapor; probably for cvapor, and akin to Gr. ?
   smoke, ? to breathe forth, Lith. kvepti to breathe, smell,
   Russ. kopote fine soot. Cf. Vapid.] [Written also
   vapour.]
   [1913 Webster]
   1. (Physics) Any substance in the gaseous, or aeriform,
      state, the condition of which is ordinarily that of a
      liquid or solid.
      [1913 Webster]

   Note: The term vapor is sometimes used in a more extended
         sense, as identical with gas; and the difference
         between the two is not so much one of kind as of
         degree, the latter being applied to all permanently
         elastic fluids except atmospheric air, the former to
         those elastic fluids which lose that condition at
         ordinary temperatures. The atmosphere contains more or
         less vapor of water, a portion of which, on a reduction
         of temperature, becomes condensed into liquid water in
         the form of rain or dew. The vapor of water produced by
         boiling, especially in its economic relations, is
         called steam.
         [1913 Webster]

               Vapor is any substance in the gaseous condition
               at the maximum of density consistent with that
               condition. This is the strict and proper meaning
               of the word vapor.                 --Nichol.
         [1913 Webster]

   2. In a loose and popular sense, any visible diffused
      substance floating in the atmosphere and impairing its
      transparency, as smoke, fog, etc.
      [1913 Webster]

            The vapour which that fro the earth glood [glided].
                                                  --Chaucer.
      [1913 Webster]

            Fire and hail; snow and vapors; stormy wind
            fulfilling his word.                  --Ps. cxlviii.
                                                  8.
      [1913 Webster]

   3. Wind; flatulence. [Obs.] --Bacon.
      [1913 Webster]

   4. Something unsubstantial, fleeting, or transitory; unreal
      fancy; vain imagination; idle talk; boasting.
      [1913 Webster]

            For what is your life? It is even a vapor, that
            appeareth for a little time, and then vanisheth
            away.                                 --James iv.
                                                  14.
      [1913 Webster]

   5. pl. An old name for hypochondria, or melancholy; the
      blues. "A fit of vapors." --Pope.
      [1913 Webster]

   6. (Pharm.) A medicinal agent designed for administration in
      the form of inhaled vapor. --Brit. Pharm.
      [1913 Webster]

   Vapor bath.
      (a) A bath in vapor; the application of vapor to the body,
          or part of it, in a close place; also, the place
          itself.
      (b) (Chem.) A small metallic drying oven, usually of
          copper, for drying and heating filter papers,
          precipitates, etc.; -- called also air bath. A
          modified form is provided with a jacket in the outside
          partition for holding water, or other volatile liquid,
          by which the temperature may be limited exactly to the
          required degree.

   Vapor burner, a burner for burning a vaporized hydrocarbon.
      

   Vapor density (Chem.), the relative weight of gases and
      vapors as compared with some specific standard, usually
      hydrogen, but sometimes air. The vapor density of gases
      and vaporizable substances as compared with hydrogen, when
      multiplied by two, or when compared with air and
      multiplied by 28.8, gives the molecular weight.

   Vapor engine, an engine worked by the expansive force of a
      vapor, esp. a vapor other than steam.
      [1913 Webster]

3. The Collaborative International Dictionary of English v.0.48
Vapor \Va"por\, v. i. [imp. & p. p. Vapored; p. pr. & vb. n.
   Vaporing.] [From Vapor, n.: cf. L. vaporare.] [Written
   also vapour.]
   [1913 Webster]
   1. To pass off in fumes, or as a moist, floating substance,
      whether visible or invisible, to steam; to be exhaled; to
      evaporate.
      [1913 Webster]

   2. To emit vapor or fumes. [R.]
      [1913 Webster]

            Running waters vapor not so much as standing waters.
                                                  --Bacon.
      [1913 Webster]

   3. To talk idly; to boast or vaunt; to brag.
      [1913 Webster]

            Poets used to vapor much after this manner.
                                                  --Milton.
      [1913 Webster]

            We vapor and say, By this time Matthews has beaten
            them.                                 --Walpole.
      [1913 Webster]

4. The Collaborative International Dictionary of English v.0.48
Vapor \Va"por\, v. t.
   To send off in vapor, or as if in vapor; as, to vapor away a
   heated fluid. [Written also vapour.]
   [1913 Webster]

         He'd laugh to see one throw his heart away,
         Another, sighing, vapor forth his soul.  --B. Jonson.
   [1913 Webster]

Thesaurus Results for Vapor:

1. Moby Thesaurus II by Grady Ward, 1.0
Barnumize, London fog, London special, Old Faithful, air, airy nothing, apparition, autism, babble, blabber, blather, blow, bluff, bluster, bluster and bluff, boast, boiling water, bombast, bounce, brag, brainchild, breathe out, bubble, bull, bullshit, bully, chimera, cloud, daydream, deception, delirium, deluded belief, delusion, depression, dereism, distemper, draw the longbow, dream, dream vision, dreamland, dreamworld, drisk, drivel, drizzling mist, drool, eidolon, emit, ether, evacuate, exhalation, exhale, exhaust, expire, false belief, fancy, fantasque, fantasy, fiction, figment, film, flourish, fog, frost smoke, fume, gabble, gas, gasconade, gauze, geyser, gibber, gibble-gabble, give off, give out, give vent to, hallucination, haze, hector, hot spring, hot water, hypochondria, hysteria, idle fancy, ignis fatuus, illusion, imagery, imagination, imagining, inflate, insubstantial image, intimidate, invention, jabber, lay it on, let out, maggot, make-believe, misbelief, misconception, mist, morbidity, myth, nervousness, open the floodgates, open the sluices, out-herod Herod, pea soup, pea-soup fog, peasouper, phantasm, phantom, piffle, pile it on, pipe dream, pontificate, prate, prattle, puff, rage, rant, rattle, rave, reek, rheuminess, roister, rollick, romance, self-deceit, self-deception, self-delusion, shadow, sick fancy, slang, smog, smoke, speak for Buncombe, spirit, splutter, sputter, steam, storm, swagger, swashbuckle, talk big, talk highfalutin, talk nonsense, the pip, thermae, thick-coming fancies, thin air, throw off, trick, trip, twaddle, twattle, vaunt, vision, waffle, whim, whimsy, wildest dreams, wrong impression
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